It's wise to collect configuration information on your hardware before installing. Know the vendor and model number of each card in your machine; collect the IRQs and DMA channel numbers. You probably won't need this information -- but if it turns out you do, you'll need it very badly.
If you have a SCSI CDROM you can often still boot from it, but it gets a little more motherboard/BIOS dependent. Those who know enough to spend the extra dollars on a SCSI CDROM drive probably know enough to figure it out.
The README and FAQ files. These will usually be located in the top-level directory of your CD-ROM and be readable once the CD-ROM has been mounted under Linux. (Depending on how the CD-ROM was generated, they may even be visible under DOS/Windows.) It is a good idea to read these files as soon as you have access to them, to become aware of important updates or changes.
A number of bootdisk images (often in a subdirectory). If your CD-ROM is not bootable, one of these is the file that you will write to a floppy to create the boot disk. You'll select one of the above bootdisk images, depending on the type of hardware that you have in your system.
The issue here is that some hardware drivers conflict with each other in strange ways, and instead of attempting to debug hardware problems on your system it's easier to use a boot floppy image with only the drivers you need enabled. (This will have the nice side effect of making your kernel smaller.)
A rescue disk image. This is a disk containing a basic kernel and tools for disaster recovery in case something trashes the kernel or boot block of your hard disk.
RAWRITE.EXE. This is an MS-DOS program that will write the contents of a file (such as a bootdisk image) directly to a floppy, without regard to format.
You only need RAWRITE.EXE if you plan to create your boot and root floppies from an MS-DOS system. If you have access to a UNIX workstation with a floppy drive instead, you can create the floppies from there, using the `dd' command, or possibly a vendor-provided build script. See the man page for dd(1) and ask your local UNIX gurus for assistance. There's a dd example later in this document.
The CD-ROM itself. The purpose of the boot disk is to get your machine ready to load the root or installation disks, which in turn are just devices for preparing your hard disk and copying portions of the CD-ROM to it. If your CD-ROM is bootable, you can boot it and skip right to preparing your disk.